merge mapper code from FCEUX

[fceu.git] / boards / ghostbusters63in1.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2007 CaH4e3\r
 *\r
 * This program is free software; you can redistribute it and/or modify\r
 * it under the terms of the GNU General Public License as published by\r
 * the Free Software Foundation; either version 2 of the License, or\r
 * (at your option) any later version.\r
 *\r
 * This program is distributed in the hope that it will be useful,\r
 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
 * GNU General Public License for more details.\r
 *\r
 * You should have received a copy of the GNU General Public License\r
 * along with this program; if not, write to the Free Software\r
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA\r
 * 63in1 ghostbusters\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 reg[2], bank;\r
static uint8 banks[4] = {0, 0, 1, 2};\r
static uint8 *CHRROM=NULL;\r
static uint32 CHRROMSIZE;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {reg, 2, "REGS"},\r
  {&bank, 1, "BANK"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  if(reg[0]&0x20)\r
  {\r
    setprg16r(banks[bank],0x8000,reg[0]&0x1F);\r
    setprg16r(banks[bank],0xC000,reg[0]&0x1F);\r
  }\r
  else\r
    setprg32r(banks[bank],0x8000,(reg[0]>>1)&0x0F);\r
  if(reg[1]&2)\r
    setchr8r(0x10,0);\r
  else\r
    setchr8(0);\r
  setmirror((reg[0]&0x40)>>6);\r
}\r
\r
static DECLFW(BMCGhostbusters63in1Write)\r
{\r
  reg[A&1]=V;\r
  bank=((reg[0]&0x80)>>7)|((reg[1]&1)<<1);\r
//  FCEU_printf("reg[0]=%02x, reg[1]=%02x, bank=%02x\n",reg[0],reg[1],bank);\r
  Sync();\r
}\r
\r
static DECLFR(BMCGhostbusters63in1Read)\r
{\r
  if(bank==1)\r
    return X.DB;\r
  else\r
    return CartBR(A);\r
}\r
\r
static void BMCGhostbusters63in1Power(void)\r
{\r
  reg[0]=reg[1]=0;\r
  Sync();\r
  SetReadHandler(0x8000,0xFFFF,BMCGhostbusters63in1Read);\r
  SetWriteHandler(0x8000,0xFFFF,BMCGhostbusters63in1Write);\r
}\r
\r
static void BMCGhostbusters63in1Reset(void)\r
{\r
  reg[0]=reg[1]=0;\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
static void BMCGhostbusters63in1Close(void)\r
{\r
  if(CHRROM)\r
    FCEU_gfree(CHRROM);\r
  CHRROM=NULL;\r
}\r
\r
void BMCGhostbusters63in1_Init(CartInfo *info)\r
{\r
  info->Reset=BMCGhostbusters63in1Reset;\r
  info->Power=BMCGhostbusters63in1Power;\r
  info->Close=BMCGhostbusters63in1Close;\r
\r
  CHRROMSIZE=8192; // dummy CHRROM, VRAM disable\r
  CHRROM=(uint8*)FCEU_gmalloc(CHRROMSIZE);\r
  SetupCartPRGMapping(0x10,CHRROM,CHRROMSIZE,0);\r
  AddExState(CHRROM, CHRROMSIZE, 0, "CHRROM");\r
\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r